How to prove that sum of triangle abc=180
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according to theorem 4.6,
sum of the angles of a triangle is 180 degrees
let bac=1 abc=2 acb=3
bac=ace (alternatye angles)
abc ecd (corresponding angles)
bca=bca (reflex angle)
bac+abc+bca=1+2+3= A+B+C=180 DEGREES
sum of the angles of a triangle is 180 degrees
let bac=1 abc=2 acb=3
bac=ace (alternatye angles)
abc ecd (corresponding angles)
bca=bca (reflex angle)
bac+abc+bca=1+2+3= A+B+C=180 DEGREES
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